Veterans Day Saving Are On! - Take 17.76% Off Almost Everything
Use Code: HONOR1776

24 Hour Flash Sale - 10% Off Regular Priced Ammo w/ Code: AMMO10

NO.4 COMET FLUX Reviews & Ratings

BROWNELLS NO.4 COMET FLUX

The Brownells No. 4 Comet Flux is a specialized soldering flux developed specifically for use with Brownells Hi-Force 44™ Solder. Formulated to clean metal surfaces during the soldering process, this high-quality flux helps remove oxides and contaminants that can interfere with solder adhesion, resulting in stronger, more reliable joints on firearm components and other metalwork projects.

Designed for gunsmithing applications, No. 4 Comet Flux works exceptionally well on steel, stainless steel, nickel, brass, and copper. By preventing black oxide formation during heating, it helps reduce cleanup time and contributes to cleaner, more professional-looking solder joints. Whether installing sights, attaching ribs, mounting scope bases, or performing restoration work, this flux promotes improved solder flow and stronger bonds.

FEATURES

Formulated specifically for Hi-Force 44™ Solder
Removes oxides and contaminants from metal surfaces
Promotes strong, reliable solder joints
Helps improve solder flow and adhesion
Prevents black oxide formation during soldering
Reduces cleanup time after soldering
Suitable for steel, stainless steel, nickel, brass, and copper
Ideal for firearm assembly, repair, and restoration
Easy-to-use flux formulation
Made in the USA

SPECS

Brand: Brownells
Product Name: No. 4 Comet Flux
Application: Soldering and Metal Joining
Form: Powder
Color: Clear
Container Size: 6 fl. oz.
Item Weight: 0.375 lb.
Quantity: 1
Country of Origin: USA
Recommended Use: Brownells Hi-Force 44™ Solder
Compatible Materials: Steel, Stainless Steel, Nickel, Brass, Copper

CUSTOMER INSIGHTS

Gunsmiths frequently pair No. 4 Comet Flux with Hi-Force 44™ Solder for sight installations, rib work, and other firearm soldering projects. Users appreciate its ability to improve solder flow while helping prevent oxidation that can compromise joint quality. The reduction in post-solder cleanup is also a commonly valued benefit.

The Brownells No. 4 Comet Flux is a purpose-built gunsmithing flux designed to maximize the performance of Hi-Force 44™ Solder. By removing oxides, promoting solder adhesion, and reducing black oxide formation, it helps produce strong, clean solder joints on steel, stainless steel, brass, copper, and nickel components while simplifying cleanup after the job is complete.

View Product

Write a review

4 Stars

2 Stars

Reviews Summary

The NO.4 Comet Flux receives mixed reviews, with many praising its effectiveness with certain solders, particularly for jobs needing lower temperatures. However, some users experienced issues with its viscosity and evaporation rate, leading to dissatisfaction. The product shines in specific contexts but has limitations with certain solder types, which affects its overall rating.

What Reviewers Are Saying

Compatibility with Solders

60%

Many users report that NO.4 Comet Flux performs well with specific solders, such as Hi-Force 44 and 355 solder. Several reviews highlight successful applications in soldering tasks. However, there's significant concern about its effectiveness with other solder types, leading some users to seek alternatives.

Viscosity and Evaporation Issues

40%

A common complaint is that the flux is too thin and evaporates too quickly, which inhibits its ability to function effectively. Users note that this inconsistency can lead to failed soldering attempts and frustration, negatively impacting their overall experience.

Application in Various Projects

50%

Several reviewers share positive experiences using NO.4 Comet Flux across a range of applications, from firearms to automotive projects. Users appreciate that it allows soldering at lower temperatures, making it suitable for sensitive tasks without the risk of damage from excess heat.

Consumer Recommendations and Alternatives

30%

Some reviewers suggested using alternative fluxes that performed better in their soldering activities, indicating dissatisfaction with the Comet Flux. Recommendations for superior products aimed at achieving better results were common, showcasing the search for better options.

Value Perceived vs. Quantity

20%

A few users expressed disappointment regarding the amount of flux included for its price, stating they felt it was excessive to buy a larger quantity for limited use. This concern reflects a perception that the product isn't cost-effective for small-scale needs.

Sort by Filter by rating

It can work

I bought this product last year when I purchased some Hi-Force 44 ribbon silver solder. I only used them for the first time this week when I was mounting a front sight base on a Mossberg 590. At first I used my regular silver solder paste flux with the Hi-Force but nothing would adhere after repeated tries. It eventually dawned on me that the solder was beading and flowing out before the flux did, so I switched to Comet because it operates at a much lower temperature. This time the sight adhered.